Designing and Implementing Linux Firewalls with QoS Using Netfilter, ...
Lucian Gheorghe
Zabbix 5 IT Infrastructure Monitoring Cookbook
Nathan Liefting & Brian van Baekel
SSH Mastery: OpenSSH, PuTTY, Tunnels and Keys
Michael W Lucas
tmux (for Diego Cohen)
Brian P. Hogan
The Cybersecurity Self-Help Guide
ARUN. SONI